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The problem with the auto store is getting the correct cap. Since no GM car has used the 5.7 in a long time, most stores will search for a 99-01 Van or HD truck. That cap MAY work, but is NOT shaped or designed like the one on your boat. Also, the marine use cap and rotor are made from a different metal to combat corrosion "better".

Any MC or Bu dealer in your area will carry the same cap for Indmar engines.